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The other way to look at it is that Sona top is just overpowered. She has a 55-57% winrate depending on MMR with a decent enough pickrate. We would nerf any champ with these metrics, she violates the guidelines found here. She can lose 5% winrate and still be a reasonable pick toplane, like I suspect she will be after this changes. Will her pickrate remain as high if she's not as overpowered? Probably not.